function setCookie(name,value,expires)
{
    var exp = new Date()
    exp.setTime(exp.getTime() + expires*60*60*1000)
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString()
}

function getCookie(name)
{
    var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)")
    if(arr=document.cookie.match(reg))
        return unescape(arr[2]);
    else
        return null;
}

function delCookie(name)
{
    var exp = new Date()
    exp.setTime(exp.getTime() - 1000*10)
    var cval=getCookie(name)
    if(cval!=null)
        document.cookie= name + "="+cval+";expires="+exp.toGMTString()
}
